Grinding-machine.



P. J. POITRAS & W. CARON. GRINDING MACHINE.

APPLICATION :FILED sEPT.24,19o9.

96h01@ Patented June 7,1910.

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GEINDING MACHINE.

AIPLI'GATION FILED SBPT.24, 1909.

Patented June '7, 1910.

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GRINDING MACHINE. APPLICATION FILED SE PI.Z4,1909.

961@1 Patented. June 7, 1910.

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GRINDING MACHINE.

APPLIUATION FILED sBPT.24.1909.

Patented June'?,191o..

Plagne JP@ PIERRE J3. PoITEAs ANEWILFRID CARON, or EUMroRD, MAINE.

GRINDING-MACHINE Specication of Letters Patent. y Patented J 1111 7, 19.1@-

Applieation filed September 24, 1909. Serial No. 519,491.

To all 'whoml 'it may concern:y

Be it known that we, PIERRE J. PorrnAs and WILFRID CARON, citizens of the United ing machines, the object of the invention being to provide ay simple, manually operated machine for quickly sharpening the blades of shears, scissors and the like, the machine embodying several adjustments by means of which the abrasive member maybe operated at a variety of angles corresponding with the body of the cutting edge of the blade of the shears. The machine also embodies novel means for clamping the blade of a shears in a fixed position, and includes means for securely holding the point of the blade so as to enable an even sharpening of the blade to .be effected throughout the entire length thereof.

With the above and other objects in view,

the invention consists in the novel construction, combination and arrangement of parts as herein fully described, illustrated and claimed. y

In the accompanying drawings Figure 1 is a side elevation of a shears Sharpener embodying the present invention. Fig. 2 is a plan View of the'same. Fig. 3 is a Vertical cross section on the line 3 3 of Fig. 1.. Fig. 4 is a verticalcross section on the line 4 4 of Fig. 1. Fig. 5 is a vertical cross section on the line 5 5 of Fig. 1. Fig. G is a detail vertical cross section on the line (3 6 of Fig. 3. Fig. 7 is a central verticall longitudinal section through the machine. Fig. 8 is a vertical cross section on the line 8 8 of Fig. 7.

The grinding machine contemplated in Opposite the jaw 5 is arranged a clamping jaw. 6 of the pivoted member 7 of the vise,

said pivoted member being4 fulcrumed at a point'intermediate its ends as shown at 8 on a short lateral bracket 9 extending from the standard 3.- The jaws are forced together by means of a clamping screw l0, which is threaded through an opening in the standard 3 and bears at its end against the lower arm of the member 7 of the vise, as clearly shown in Figs. 1 and 7, the end of the screw preferably litting in a socket 11 in the member 7 as shown in Fig. 7. At the opposite end of the base 1, there is arranged a hollow or tubular standard 13 in which is slidingly arranged a bearing post 14 adapt ed to be adjusted up and down and held at any desired point by means of a set screw 15. The upper end of the bearing post 14 is enlarged to forma bearing head 1G which is provided with a spheroidal socket 17. In this socket17 is arranged a ball shaped bearing 18 and through said bearing there extends a guide opening 19 which receives a reciprocatory slide rod 20 forming part of the hand-operated sharpening member of the machine.

The sharpening member of the machine comprises a stone holder consisting of a flat body portion 21 provided at one end with a tee-shaped head 22 formed in its outer face with a threaded opening 23'to receive the correspondingly. threaded end of the slide i'od 20, as clearly shown in Fig. 7. At its opposite end the body 1 is provided with a longitudinally extending threaded shank 24 upon which is laced a clamping head 25 adapted to be clgmped against the adjacent ends of a `pair of Shar ening stones 26 and 27 which are thus hel in place against the opposite sides of the body 21 and between the heads 22 and 25.

28 designates a handle which is internally threaded to constitute a nut and is adapted to screw upon the 'threaded shank 24 up against the clamping head 25, as shown in Fig. 7, so as'to force the head 25 against the grinding or sharpening stones.

The rod 20 which slides through the bearing 18 guides the sharpening stones in their movement across the cuttin edge of the plate of the shears and in or er to limit the `reciprocatory movements of the stones, stop collars 29 and 30 are secured to the rod 20 at suitable points at sides of the bearing 18 said stops bein adapted to come in contact with the bearing head l16 to prevent the stones 26 and 27 from passing entirely out of engagement with the shear blades. One

of the stones 26 may be of fine textile and the other of coarse textile so that after the coarser stone has been employed to sharpen the shears, the reciprocatory member of the machine may be inverted or turned over bottom side up to bring the other or ner stone into use. `The reciprocatory member is operated by means of the handle 28 which is grasped in the hand of the operator and thrust back and forth in a manner readily understood.

' ably square in cross section while the projecting end of the shank is threaded to receive a clamping nut 34.

In operation, the blade of the shears is clamped between the jaws of the vise and the standard 3 is then adjusted in height to bring the edge of the shears and the abrasive surface of the stone into parallelism. lf the verticaladjustment of the standard 3 is not sulficient further adjustment may be effected by raising andy lowering the bearing head 1G. After finally bringing the stone into the proper relation to the edge of the shears, the coarser` side of the Sharpener is first reciprocatedv across the inner edge of the blade and the work is completed by dressing said edge oit with the aid of the finer stone. During this operation the blade of the shears is held between the main jaws of the device while the point of the shears is held rigidly pointed by means of the teeyshaped point clamp 32. It will be understood that the stone sharpenin member may be reversed or turned overiwithout detaching the same from the machine. The stone is also adapted to be swung in the arc of a circle while in contact with the edge of the shear blade, indicated in plan View in Fig. 2.

We claim l. A sharpening device of the class specilied, comprising a base, a vertically adjustable vise thereon adapted to clamp and hold the blade to be sharpened, a vertically adjustable bearing post arranged at a distance from the vise standard, and a reciprocatory sharpening member provided with a guide rod supported by the bearing post, said sharpening member being adapted to be moved back and forth across the edge of the blade to be sharpened, substantially as described. y

2. A sharpening device of the class s ecied, `comprising a base, a vertically adjustable blade holding vise mounted on said base,A

and a sharpening member comprising a body having a tee-shaped head at one end thereof, a movable clamp head at the opposite end thereof, one or more sharpening stones held between said heads, a handle at one end of said sharpening member, and a guide'rod projecting from the opposite end thereof and working through `a guide opening in said bearing head.

3. A .sharpening device of the class described comprising a base, a vertically adjustable blade holding vise mounted thereon, a vertically adjustable bearing head supported by the base, and a stone holder comprising a flat bolt, a fixed tee-shaped head at one end thereof, a guide rod extending from said head through an opening in said bearing head, a movable clamping head arranged opposite the fixed head, an operating handle constituting a nut for forcing the clamping head against the sharpening stone or stones, and stop collarsv on said guide rod cooperating with said bearin head.

4. A sharpening device 0% the class described comprising a base, a vertically adjustable blade holding vise mounted on the base, a vertically adjustablev bearing head mounted on the base, a ball shaped guide mounted in a socket in saidl bearing head and provided with a guide opening, and a stone holder comprising a flat body, a tee-shaped head at one end thereof, a guide rod projecting from said head and working through the opening in the ball shaped guide, a threaded shank at the' opposite end of the holder, a-

clamp head having an opening through which said stone passes, and a combined handle and nut threaded on said shank, substantially as and for the purpose specied.

In testimony whereofwe atlix our signatures in presence of two Witnesses.

PIERRE J. POITRAS. WILFRID CARON. 

